Don't think I've seen that sink before. Should do very nice job. Can you supply dimensions? I am curious and would like to simulate it's performance. If you are interested I can give you a table of watts -vs- temp. and you will then know how many watts you are dumping in to it. It looks like might take you a while to get it up to temperature.

Just depends upon how closely you compare all the rigs. Gary's
and mine are almost exact electrical duplicates of Bill/GF's design
from finals, drivers, PDM generator, PDM modulator and filter...
But we'll let ya join the club if ya want, caw mawn.

T

"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" - Theodorus Gaza

Too high tech? I can't agree. K.I.S.S. yes.
TNX for letting me hang with you guys. Now I have to package the moddulator.....Maybe in the fall. Short term goal is to blast Hendrix
at Woodstock on July 4 at noon from new QTH.

Hey Gary,
Looks nice and neat. Keep up the good work! Remember short leads keep the leakage inductance monster away. I just gained a couple percent by removing a turn from my secondary. I had a 4 turn secondary
when I started and was close to 80% efficiency. With 2 turns and a litle more C in the load cap and it is 87%. Coil still hot so there is more efficiency hiding in my tank at 1 KW out. QRP over 90%.

Here is chart of Pd -vs- Delta_t. Heatsink more efficient - Rtheta will be lower as part gets hotter. Below is file out of last run at 200w. Check dimensions that I got it right. You can measure temp between a pair of mosfets in center to get closest. I realize I used anodize and I think your sink is not. This is ok and should actually get you closer. Sauna has a tendency to be a little pessemistic. Have you any idea what sink was designed for?

Have you any predictions of efficiency of your particular configuration? I understand that configuration is very rare. Only a few are known to exist.